package oj;

public class Num617 {
    public TreeNode mergeTrees(TreeNode root1, TreeNode root2) {
        if(root1==null){
            return root2;
        }
        if (root2==null){
            return root1;
        }
        TreeNode root=new TreeNode(root1.val+root2.val);
        root.left=mergeTrees(root1.left,root2.left);
        root.right=mergeTrees(root1.right,root2.right);

        return root;

    }
}
